2026-04-18T12:16:01Zhttp://doidb.wdc-terra.org/oaip/oai

oai:doidb.wdc-terra.org:67282024-09-04T09:03:04ZDOIDBDOIDB.ICGEM

false4DOIDB.ICGEM 10.5880/ICGEM.2019.007 Zingerle, Philipp Philipp Zingerle Institute of Astronomical and Physical Geodesy, Technical University of Munich, Germany Pail, Roland Roland Pail 0000-0002-4364-4012 Institute of Astronomical and Physical Geodesy, Technical University of Munich, Germany Gruber, Thomas Thomas Gruber 0000-0001-5210-1995 University Bern, Bern, Switzerland Oikonomidou, Xanthi Xanthi Oikonomidou Institute of Astronomical and Physical Geodesy, Technical University of Munich, Germany The experimental gravity field model XGM2019e GFZ Data Services 2019 geodesy global gravity field model ICGEM GOCO GOCE EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY Ince, Elmas Sinem Elmas Sinem Ince 0000-0002-3393-1392 GFZ German Research Centre for Geosciences, Potsdam, Germany Reißland, Sven Sven Reißland 0000-0001-6293-5336 GFZ German Research Centre for Geosciences, Potsdam, Germany eng Dataset 10.1007/1345_2015_182 10.5880/icgem.2015.1 10.1016/j.jag.2015.03.001 10.5880/ICGEM.2019.002 10.5880/icgem.2017.003 10.1029/2011JB008916 6 Files application/octet-stream application/octet-stream application/octet-stream application/octet-stream application/octet-stream application/octet-stream CC BY 4.0 XGM2019e is a combined global gravity field model represented through spheroidal harmonics up to d/o 5399, corresponding to a spatial resolution of 2’ (~4 km). As data sources it includes the satellite model GOCO06s in the longer wavelength area combined with terrestrial measurements for the shorter wavelengths. The terrestrial data itself consists over land and ocean of gravity anomalies provided by courtesy of NGA (identical to XGM2016, having a resolution of 15’) augmented with topographically derived gravity over land (EARTH2014). Over the oceans, gravity anomalies derived from satellite altimetry are used (DTU13, in consistency with the NGA dataset). The combination of the satellite data with the terrestrial observations is performed by using full normal equations up to d/o 719 (15’). Beyond d/o 719, a block-diagonal least-squares solution is calculated for the high-resolution terrestrial data (from topography and altimetry). All calculations are performed in the spheroidal harmonic domain. In the spectral band up to d/o 719 the new model shows over land a slightly improved behavior over preceding models such as XGM2016, EIGEN6c4 or EGM2008 when comparing it to independent GPS leveling data. Over land and in the spectral range above d/o 719 the accuracy of XGM2019e suffers from the sole use of topographic forward modelling; Hence, errors are increased in well-surveyed areas compared to models containing real gravity data, e.g. EIGEN6c4 or EGM2008. However, the performance of XGM2019e can be considered as globally more homogeneous and independent from existing high resolution global models. Over the oceans the model exhibits an improved performance throughout the complete spectrum (equal or better than preceding models). -180 180 -90 90